Medicinal plant Sanqi (Tianqi) Anthrax

Symptoms of seedling stage, adult stage can be the disease, seedling stage caused by the tripping or top dry. In the adult stage, the disease mainly affects the leaves, petioles, stems and flowers and fruits. The leaves were infected with round or near-round yellow-brown lesions. The edges were red-brown, and the diseased parts were easily broken and perforated. Petiole and stem infected with fusiform yellow-brown pitted spots, causing petiole contortion or stem distortion. Injury stem base causes lodging of the plants or rotting of the roots. Pedicel and flower discs appear to have dried seeds. The fruit is also infected with a round yellow depression spot, causing the fruit to turn brown and rot.

Pathogens Colletotrichμm g10eosporioides Penz. and C.dematiμm (Pers.) Grove said that Colletotrichum gloeosporioides and Black-line anthracnose belonged to the fungi Aspergillus spp. C.g10eosporioides On the PDA, the bacterial flora was white at first, then grayed out, and the aerial mycelium was light gray; the viscous conidia group was light red after the initial white; the bristles were numerous; the conidial stems were branched; the sporulation cells were bottle-shaped. Bottle-body sporulation; conidia, colorless unit cells, sickle shape, sharp tip, obtuse end, 19-232.5-4.0 (μm); appressorium rich, dark brown, oval, round Or stick-shaped, most of the rules of the edge. C.dematiμm See Ophiopogon japonicus.

Transmission routes and pathogenic conditions The pathogens use hyphae to survive winters in the cortex of the seed soft fruit or on the surface of red seeds (seeds), and the main site of the disease is overwintering. The disease is mainly transmitted by the red seed, causing the above symptoms, and the infection of the red filariasis has become the source of infestation in early years. In the field, germs mainly occur during the rainy season. In general, high-temperature, high-humidity disease spreads rapidly from June to July, continuously and continuously raining, and the weather is hot and humid after the rain. The cultivation is too dense to induce the epidemic.

Prevention methods (1) Clean the garden in the winter and burn the sick body in time. (2) Apply formula fertilization technology, apply sufficient organic fertilizer, increase phosphorus and potassium fertilizers, and improve disease resistance. (3) Seed (red) treatment. After soaking the red seeds with 150 % formalin 150 times for 10 minutes and removing the soft peels, use 0.5% - 1.5% 75% thiophanate-methyl or 70% thiophanate-methyl wettable powder for dressing. . Can also be used 75% thiophanate-methyl 400 times solution and 45% zein zinc wettable powder 200 times 1:1 mixed soaking for 2 hours, excellent control effect. (4) Promote the use of rain-proof cultivation methods. During the rainy season, the top of the shade shelter was covered with a plastic film to prevent the plants from raining and the incidence was significantly reduced. (5) Adjust the ceiling or use the shade net to control the light transmittance. In the seedling stage of Panax pseudoginseng, the light transmittance is adjusted to 17% to 25%, and 2 to 4 years old to 20% to 35%. The annual light transmittance in early spring or late autumn may be slightly higher. (6) Spray 45% zeocin WP 400 times or 75% thiophanate-methyl wettable powder 1000 times and 50% carbendazim WP 800-1000 times immediately after emergence or after rain. Liquid, 25% carbon tetrachloride wettable powder 500 times, 25% benomyl EC 900 times.

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